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Comptes Rendus Physique
Volume 8, n° 3-4
pages 355-364 (avril 2007)
Doi : 10.1016/j.crhy.2007.04.001
The Lyot Project: status and results
Le projet Lyot : état actuel et résultats
 

Anand Sivaramakrishnan a, , Ben R. Oppenheimer a , Sasha Hinkley a , Douglas Brenner a , Rémi Soummer a , Jacob L. Mey b, James P. Lloyd c , Marshall D. Perrin d , James R. Graham d , Russell B. Makidon e , Lewis C. Roberts f , Jeffrey R. Kuhn g
a Astrophysics Department, American Museum of Natural History, 79th Street and Central Park West, New York, NY 10024, USA 
b Microscopy and Imaging Facility, American Museum of Natural History, 79th Street and Central Park West, New York, NY 10024, USA 
c Astronomy Department, Cornell University, 230 Space Sciences Building, Ithaca, NY 14853, USA 
d Astronomy Department, 601 Campbell Hall, University of California, Berkeley, CA 94720, USA 
e Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA 
f The Boeing Company, 535 Lipoa Pkwy, Suite 200, Kihei, HI 96753, USA 
g Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA 

Corresponding author.
Abstract

We present a retrospective on, and some new imaging data from The Lyot Project JHK coronagraph which is used behind the 3.6 m AEOS 941-channel AO telescope on Mt. Haleakala, on the island of Maui in Hawaii. This instrument is the first extreme adaptive optics' (ExAO) coronagraph ever; it opens up new scientific search spaces in direct imaging of faint companions of nearby stars. It also blazed a trail for current ExAO systems being developed for ESO-VLT and Gemini telescopes. Amongst other things, the Lyot Project has been used to demonstrate a device for precision coronagraphic astrometry and photometry using the novel technique of placing a wire grid over the pupil to create stable fiducial ghost images, to show the effects of frozen actuators on a deformable mirror, to refine angular differential imaging for use on the Coudé focus of Alt-Az telescopes, and to develop a coronagraphic data reduction pipeline. To cite this article: A. Sivaramakrishnan et al., C. R. Physique 8 (2007).

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Résumé

Cet article présente un historique et quelques résulats du coronographe du Lyot Project', installé sur le télescope AEOS de 3,6 m à Maui (Hawaii). Cet instrument est le premier coronographe à fonctionner avec une optique adaptive extrême (941 actuateurs) qui ouvre de nouvelles possibilités pour la recherche de compagnons faibles en bande JHK autour dʼétoiles proches. Cet instrument est également un précurseur pour les projets en développement comme ESO/SPHERE ou Gemini/GPI. En particulier, il a été utilisé pour tester un dispositif permettant lʼastrométrie et la photométrie de précision en mode coronograhique grâce à une grille en plan pupille pour former des images satellites stables de lʼétoile. Les données du projet Lyot ont également permis de montrer les effets des actuateurs bloqués sur un miroir déformable, de raffiner la technique dʼimagerie différentielle angulaire dans le cas dʼobservations au foyer coudé dʼun télescope Alt-Az et de développer une méthode pour le traitement de données coronographiques. Pour citer cet article : A. Sivaramakrishnan et al., C. R. Physique 8 (2007).

The full text of this article is available in PDF format.

Keywords : Instrumentation, Adaptive optics, Coronagraphy, Planet detection, Simultaneous polarization, Astrometry, Photometry

Mots-clés : Instrumentation, Optique adaptative, Coronographie, Detection dʼexoplanètes, Polarimétrie différentielle, Astrometrie, Photométrie




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